Oolite

[oh-uh-lahyt] /ˈoʊ əˌlaɪt/

noun, Geology.
1.
a limestone composed of minute rounded concretions resembling fish roe, in some places altered to ironstone by replacement with iron oxide.
/ˈəʊəˌlaɪt/
noun
1.
any sedimentary rock, esp limestone, consisting of tiny spherical concentric grains within a fine matrix
n.

“rock consisting of fine grains of carbonate of lime,” 1785, from Modern Latin oolites, from oo-, comb. form of Greek oon “egg” (cognate with Old English æg, see egg (n.)) + lithos “stone” (see litho-). So called because the rock resembles the roe of fish.
oolite
(ō’ə-līt’)
A sedimentary rock consisting of ooliths that are cemented together by calcium carbonate.

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